(d)
Remove the two quick-release pins, disconnect the two hold-open rods and put the two hold-open rods in the two clips on the left access door.
(e)
Install the two quick-release pins in the two brackets on the left APU compartment bulkhead.
(f)
Make sure the insulation covers are correctly attach to the APU compartment firewall.
(g)
Lift the left access door until the two APU access doors are approximately aligned.
(h)
Close the two APU access doors.
(i)
Close the six latches on the right access door.
TASK 49-81-03-202-013
4. Acoustic Liner Inspection (Fig. 201)
_________________________
A. Access
(1)
Location Zones
310 Fuselage - Station 2360 to Station 2792
(2)
Access Panels
317AL APU Access Door - Left
318AR APU Access Door - Right
B.
Procedure
S 022-025
(1)
Do this task: Acoustic Liner Removal (Par. 2).
S 212-015
(2)
Inspect the outer and inner liners of the acoustic liner (1):
(a)
Cracks or damage at the ends of the acoustic liner (1) are not permitted.
(b)
Three cracks are permitted in the acoustic liner (1) and agree with these conditions: 1) Each crack with a length less than 2.5 inches (6.4 cm) is
permitted.
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747-400
MAINTENANCE MANUAL
(c) (d) (e) 2) The permitted distance between each crack must be a minimum of 6.0 inches (15.2 cm).One crack in the acoustic liner (1), with a length less than 12 inches (30.5 cm), is permitted.Three areas with separation are permitted on the acoustic liner (1) and agree with these conditions: 1) Each area with a separation that is less than 3.0 square inches (19.4 square cm) is permitted. 2) The permitted distance between each area with separation must be a minimum of 6.0 inches (15.2 cm).Damaged areas are permitted if the distance from the ends of the acoustic liner (1) to each damage area is more than 1.5 inches (3.8 cm).
S 962-026
(3) If you find the above permitted cracks or damaged areas, replace the acoustic liner (1) in the subsequent 100 hours of APU operation.
S 962-027
(4) Replace the acoustic liner (1) if the cracks or damaged areas are more than the permitted limits.
S 422-028
(5) Do this task: Acoustic Liner Installation (Par. 3).
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747-400 MAINTENANCE MANUAL
APU EXHAUST V-BAND CLAMP - INSPECTION/CHECK
___________________________________________
1. General_______
A. This procedure gives a task to do an inspection of the V-band clamp for the APU exhaust duct.
B. The V-band clamp connects the exhaust duct to the exhaust port. You can get access to the V-band clamp through the APU access doors.
TASK 49-81-04-206-005
2. APU Exhaust V-band Clamp Inspection___________________________________
A. Access
(1)
Location Zone 317 APU Compartment-Exhaust Duct, Left Side 318 APU Compartment-Exhaust Duct, Right Side
(2)
Access Panel
317AL APU Access Door
318AR APU Access Door
B.
Procedure
S 866-009
(1)
Make sure the APU control switch on the P5 panel is OFF and attach a DO-NOT-OPERATE tag.
S 866-008
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
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